generate plotting data for 1 particular

- regularize.rb builds upon original turnstile.rb by reporting 'regular
audit events & creates a combined datetime 'string' for excel

- one_station.rb takes two inputs (output from regularize & a station
code) and extracts all data for a single station.

- compile_station.rb takes output from one_station.rb and generates
plotting data for Excel (well, you still have to run a formula to
calculate the intervals, but it's almost everything - since some data
needs to be scrubbed.